Journal article
Modulation of respiratory metabolism in response to nutrient changes along a soil chronosequence
Plant Cell And Environment, Vol.36(6), pp.1120-1134
Jun/2013
Abstract
Laboratory studies indicate that plant respiratory efficiency may decrease in response to low nutrient availability due to increased partitioning of electrons to the energy-wasteful alternative oxidase (AOX); however, field confirmation of this hypothesis is lacking. We therefore investigated plant respiratory changes associated with succession and retrogression in soils aged from 10 to 120000 years along the Franz Josef soil chronosequence, New Zealand. Respiration rates and electron partitioning were determined based on oxygen isotopic fractionation. Leaf structural traits, foliar nutrient status, carbohydrates and species composition were measured as explanatory variables. Although soil nutrient levels and species composition varied by site along the chronosequence, foliar respiration across all sites and species corresponded strongly with leaf nitrogen concentration (r2=0.8). In contrast, electron partitioning declined with increasing nitrogen/phosphorus (r2=0.23) and AOX activity correlated with phosphorus (r2=0.64). Independently, total respiration was further associated with foliar Cu, possibly linked to its effect on AOX. Independent control of AOX and cytochrome pathway activities is also discussed. These responses of plant terminal respiratory oxidases and therefore respiratory carbon efficiency to multiple nutrient deficiencies demonstrate that modulation of respiratory metabolism may play an important role in plant responses to nutrient gradients.
Details
- Title
- Modulation of respiratory metabolism in response to nutrient changes along a soil chronosequence
- Creators
- Ari Kornfeld (null)Owen K. Atkin (null)Kevin L. Griffin (null)Travis W. Horton (null)Dan Yakir (null) - 972WIS_INST___99Matthew H. Turnbull (null)
- Resource Type
- Journal article
- Publication Details
- Plant Cell And Environment, Vol.36(6), pp.1120-1134; Jun/2013
- Number of pages
- 15
- Language
- English
- DOI
- https://doi.org/10.1111/pce.12047
- Grant note
- Marsden Fund of the Royal Society of New Zealand; Education New Zealand; University of Canterbury; Natural Environment Research Council (NERC) in the UK [NE/D01168X/1, NE/F002149/1]; Australian Research Council [ARC FT0991448, DP0986823]We are especially grateful to the Department of Conservation at Franz Josef for providing access to the sites. This work was supported by a grant from the Marsden Fund of the Royal Society of New Zealand as well as scholarship grants for A. K. from Education New Zealand and the University of Canterbury, with additional partial funding from the Natural Environment Research Council (NERC) in the UK (NE/D01168X/1 and NE/F002149/1) and the Australian Research Council (ARC FT0991448 and DP0986823). The expert technical assistance of Mr David Sherlock, Ms Stephanie McCaffery and Darren Smalley is gratefully acknowledged. We would also like to thank the three anonymous reviewers whose feedback helped improve our final manuscript._ALMAME_DELIMITER_
- Record Identifier
- 993264673303596
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